Oval Ultra mass MKII CN003, Instructions Manual, Page: 11 / 72

L-718-8-E
11
Zero stability error (kg/min.)
Zero stability error
＝－ － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － － × 100%
Flowrate during the test (kg/min)
CAUTION: 1. For applications of volume flow measurement subject to taxation or transactions,
consult factory.
2. In gas measurement, the maximum permissible flow velocity varies with
the kind of gas and certain gases may be unacceptable for measurement.
In such a case, consult the factory.
2.3.4 Pressure Losses
◎
How to determine pressure loss
(1) Find the pressure loss coefficient C from the flowrate (kg/min.) and viscosity of parameter (mPa ・ s).
Dividing this value C by specific gravity d (1 for water) gives the pressure loss, or
C
P ＝－－－ (MPa)
d
For liquids with viscosities below 1 mPa ・ s, use the curve μ ＝ 1.0 mPa ・ s.
(2) For high-viscosity liquids not shown in the graph, calculate the pressure loss by the following
equation:
μ
2
1
P
2
＝C×－－－ × －－
μ
1
d
where P
2
: Pressure loss of high-viscosity liquid (MPa)
μ
2
: Viscosity of high-viscosity liquid (mPa ・ s)
d: Specific gravity of high-viscosity liquid (1 for water)
μ
1
: Maximum viscosity shown in the graph (mPa ・ s)
C: Pressure loss coefficient found from the maximum viscosity curve at a given
flowrate (kg/min.)
●
Model CN003
Continued on next page
100
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
1000m
Pa
・
s
100m
Pa
・
s
10mPa
・
s
1mPa
・
s
0.01mP
a
・
s
0.01 0.1 1 10
Flowrate (kg/min)
Pressure Loss Coeff.C